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  • shoyer · 2 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
506208573 https://github.com/pydata/xarray/issues/2940#issuecomment-506208573 https://api.github.com/repos/pydata/xarray/issues/2940 MDEyOklzc3VlQ29tbWVudDUwNjIwODU3Mw== shoyer 1217238 2019-06-27T06:20:19Z 2019-06-27T06:20:19Z MEMBER

https://github.com/pydata/xarray/pull/3040 is my preferred fix for the rolling window issue. I plan to merge it sometime tomorrow unless I get any comments....

 
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   test_rolling_wrapped_dask is failing with dask-master 440233667
504058279 https://github.com/pydata/xarray/issues/2940#issuecomment-504058279 https://api.github.com/repos/pydata/xarray/issues/2940 MDEyOklzc3VlQ29tbWVudDUwNDA1ODI3OQ== shoyer 1217238 2019-06-20T14:55:04Z 2019-06-20T14:55:04Z MEMBER

Looking into this in more detail, the fix looks somewhat non-trivial. For example, we definitely are not padding by enough inside dask_rolling_wrapper if center=False: https://github.com/pydata/xarray/blob/145f25f69078f245313bb8e07b7c6af7509d0de8/xarray/core/dask_array_ops.py#L29

I'm not sure if this was ever tested properly, at least for dask arrays with multiple chunks. My guess is that this previously worked by consolidating dask arrays into a single chunk, which would simply fail for arrays that are larger than fit into memory.

For now, I think it would be safest to issue a new release that simply disables rolling() methods on dask arrays (by raising an error), and to save a full fix for later. I am concerned about letting the current behavior stick around, which silently calculates the wrong result.

 
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   test_rolling_wrapped_dask is failing with dask-master 440233667

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